Feature/color actuator plugin

[FilipeAlmeida-Movai]

This PR adds the EmissivePropertyController GUI plugin that enables the ability to change Mode_Link material emissive color during runtime simulation. It is subscribing to a StringMsg on topic /model/material The message must follow the structure: "Model_Name::Link_Name-RED-GREEN-BLUE-ALPHA" The color data accept float range 0.0 to 1.0. Also, this is a GUI plugin that needs to be loaded in the simulation to enable the color change.

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Test:

• Install this plugin into the Ignition container
• Launch a Tugbot simulation
• Using the plugin manager of Ignition to search and add the "Emissive Property Controller" GUI plugin
• Open a terminal with access to the ignition transport (ignition containera or spawner container)
• Send ignition messages to change a link material color: ign topic -t /model/material -m ignition.msgs.StringMsg -p "data: 'tugbot::led_link-1-0-0-1'"

This will change the led_link of the tugbot model to the Red color. You can change the message to send different colors.

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[FilipeAlmeida-Movai]

Should we change the name material_controller into something more specific like emissive_property_controller?

We can change it.

[MithunKinarullathil]

Should we change the name material_controller into something more specific like emissive_property_controller?

We can change it.

Cool. Just thought the material_controller is too wide context.